chromium/content/test/data/gpu/pixel_background_image.html

<!DOCTYPE html>
<html>
<head>
<title>Background Image Test: Repeat single_face background image</title>
<style type="text/css">
.nomargin {
  margin: 0px auto;
}
</style>
<script>
var g_swapsBeforeAck = 15;

function main() {
  loadAndDecodeImage("single_face.jpg");
}

function loadAndDecodeImage(src) {
  var img = new Image ();
  img.onload = () => {
    // Issue a decode command
    img.decode().then( () => {
      document.body.style.backgroundImage = 'url('+img.src+')';
      document.body.style.backgroundRepeat = "repeat";
      waitForFinish();
    }).catch( () => {
      document.body.appendChild(new Text("Could not load and decode the image :("));
      domAutomationController.send("FAILURE");
    });
  }
  img.src = src;
}

function waitForFinish()
{
  if (g_swapsBeforeAck == 0) {
    domAutomationController.send("SUCCESS");
  } else {
    g_swapsBeforeAck--;
    window.requestAnimationFrame(waitForFinish);
  }
}
</script>
</head>
<body onload="main()">
</body>
</html>